Cylinder-tooth.



No. 664,446. Patented D06. 25, I906. v P. SWENSON.

G XLINDE B TOOTH.

(Application filed Mar. 1, 1900.: (No Modal.)

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% m Q'MM M m: NORRIS PZYERS co. PHOTO L|THO., WASHINGTON. o. c.

nesota, have invented certain new and useful UNITED STATES PATENT OFFICE.

PAUL SWENSON, OF HOPKINS, MINNESOTA.

CYLINDER-TOOTH.

srncmIcA'rIoN forming part or Letters Patent No. 664,446, dated December a, mot.

Application filed March 1, 1900- To all whom it may concern.-

Be it known that 1, PAUL SWENSON, a citizen of the United States, residing at Hopkins, in the county of Hennepin and State of Min- Improvements in Cylinder-Teeth; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention has for its object to provide an improvement in cylinder-teeth for threshing-machines; and to this end it consists of the construction and combination of parts hereinafter described, and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Figure 1 is a view, partly in side elevation and partly in vertical section, showing a portion of the threshing-cylinder with one of my improved cylinder tceth applied thereto. Fig. 2 is a section approximately on the line m x of Fig. 1, with the tooth shown in full; and Fig. 3 is a horizontal section on the line 00 00 of Fig. l.

Of the parts of the threshing-cylinder the numeral 1 indicates a portion of one of the cylinder-bands, and the numerals 2 and 3 indicate one of the cylinder bars, which, as shown, is formed by two sections secured longitudinally together.

The numeral 4 indicates the cylinder-tooth, on the screwthreaded end of which is a nut 5.

The numeral 6 indicates an ordinary washer.

The shank 7 of the tooth 4 is four-sided and varies materially from a rectangle in crosssection, in that its sides 7 are divergent, as best shown in Fig. 3. The other two sides 7 of the shank 7 are shown as slightly convex; but they might be fiat so far as my invention is concerned. The four sides 7 and 7 converge in the direction of the screw-threaded end 7 of the tooth 4..

The screw-threaded end of the a cylindertooth passes loosely through a perforation 9 in the bar-section 3, and the four sides of the shank portion 7 snugly fit in a seat or socket Serial No. 7,l)36. (No model.)

tion of the bar which is marked 2 alone would resist the backward movement of the cylinder-tooth under the strain of its work or under extreme strains put thereon. Hence with the old construction this portion 2 of the bar, it has been found in practice, will soon become bulged, so that the cylinder-tooth will become loosened and free for increased pounding actions on the said portion 2. As a further result of this loosening the cylinder-tooth is rendered more liable to be bent and broken.

In virtue of my improved arrangement, diverging sides 7**, the strains put upon the tooth when at work orby sudden and extreme strains are not only resisted by the por-- tion 2 of the'bar 2, but any tendency of the said sides 7 to move toward the converging extremity of the seat or socket within the bar 2 has a wedging action or an action similar to that of the keystone of an arch, so that such movement will be resisted by the tensile strength of the entire bar 2. Furthermore, these strains on the improved tooth tend to force the narrower rear portion of the shank 7 downward into the socket, and as the shank is also tapered longitudinally it is thereby more tightly forced into its seat.

By actual tests I have demonstrated that cylinder-teeth constructed in accordance with my present invention are much stronger than cylinder-teeth as previously constructed and that they will not elongate their seats in the cylinder-bars, and hence will not work loose.

It will of course be understood that the shank of the tooth above described may be varied somewhat in plan within the scope of my invention. For instance, one of the sides in the bar-section 2 which seat or socket has 7 of the tooth-shank might extend in a plane at a right angle to the bar and the otherside 7 thereof be extended in a plane deviating from a right angle to the bar, so as to give the wedge or key shape'to the shank. However, the arrangement illustrated is preferred,

for the reason that the strains are thrown equally on both sides of the shank when the tooth is subjected to working or more intense strains. o

What I clainnand desire to secure by Let ters Patent-of the United States, is as follows: i

1. A cylinder-tooth having a shank portion formed with four flat sides that flare longitudinally toward the blade portion of said tooth, and which shank portion in cross-seetion converges toward the rear of said tooth,

substantially as and for the purposes set forth." I

2; The cylinder-tooth 4 having the shank portion 7 formed with the four flat sides that v Witnesses:

' HARRY KILGORE, F. D. MERCHANT. 

